{"type": "session", "harness": "my-agent", "id": "abc123", "name": "what time is it"}
{"type": "message", "message": {"role": "user", "content": "what time is it?"}}
{"type": "message", "message": {"role": "assistant", "content": "", "toolCalls": [{"id": "t1", "function": {"name": "get_time", "arguments": "{}"}}]}}
{"type": "message", "message": {"role": "tool", "toolCallId": "t1", "content": "2026-07-01T15:00:00Z"}}
{"type": "message", "message": {"role": "assistant", "content": "it is 15:00 UTC"}}